Westerbeke 9.0 BCG Technical Manual page 194

FAULT
Generator does not
excite; 0 volts at NIL.
Low voltage at NIL
and voltage drops
further as a load is
applied.
Voltage OK at NIL and
low at FIL.
Voltage unstable.
Voltage unstable.
Westerbeke Generators
CAUSE
1. Diode(s) in exciter
rotor shorted (B-2).
2. Generator's speed
is low.
1. Diodes in exciter
rotor shorted (B-2).
2. Auxiliary windings
in exciter rotor
shorted (B-2).
1. Auxiliary windings
in the exciter rotor
B-1 shorted.
2. Exciter stator
windingA-2
is open.
3. Auxiliary winding
0-3 or C-3 open.
1. Defective regulator
board.
1. Engine is hunting.
2. Electrical connections.
188
CORRECTION
1. Check diodes in
exciter rotor as
illustrated later in this
manual, pages 191-192.
2. Check the engine's
speed (hertz).
1. Check diodes in exciter
rotor as illustrated later in
this manual, pages 191-192.
2. Check resistance values
and continuity to
ground.
1. Check resistance values
and continuity to
ground.
2. Check continuity and
connection of
windings.
3. Check continuity and
connection of winding.
1. Check stability of DC
voltage from regulator
to exciter stator
windings. Operate unit
on COMPo Replace
regulator board.
1. Check engine operation
and fuel system.
2. Check for clean and
secure connections.